Summary

PostCSS 8 was released. It added a new plugin API. Right now Gatsby does not support PostCSS 8 plugins.

Updating postcss-loader and adding postcss to dependencies for gatsby-plugin-postcss will fix the problem.

PostCSS 8 changelog does not have breaking changes related to Gatsby only removing Node.js 6 and 8 support

Feature request

An option to put the sidebar on the right instead of the left

https://github.com/getzola/zola/blob/9f367ae7e7af33b58be8335899708ab2d80f5213/src/cmd/serve.rs#L324 can happen and the user just gets a panic.

It should involve things such as description, s/w requirements, h/w requirements, schematics, usage etc.

Refer to the various Arduino project documentations for assistance.

refs: sphinx-doc/sphinx#3585 (comment)

@eric-wieser
Please let me know where you found the similar problem in apidoc.
I'll take a look